Stretchable Display Strain Sensing for Crack Prevention
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Solution Overview
Problem
Display apparatuses that are deformable beyond their normal operation range are prone to damage, such as cracking, due to the lack of effective strain sensing and control mechanisms.
Innovation Solution
A display apparatus equipped with a strain sensor to detect stretching, a signal processor to determine operation sections based on stress-strain profiles, and a control system to generate signals for controlling the display panel and stretching mechanism, including threshold values for different operation sections to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display apparatus is made deformable beyond normal operation range, then adaptability and versatility are improved, but reliability deteriorates due to damage such as cracking
Solution Approach 1:
The system performs preliminary detection of stretching operations using strain sensors before damage occurs. By detecting strain in advance and determining operation sections, the system can take preventive actions (such as controlling the display panel or stretching mechanism) to avoid cracking and damage, thus maintaining reliability while enabling deformability
Solution Approach 2:
The system continuously monitors strain through strain sensors and uses the detected characteristic values to determine current operation sections. Based on this feedback, the system generates control signals to adjust the stretching mechanism or display panel operation, creating a closed-loop control system that prevents damage while maintaining adaptability
2Reliability
If strain sensing and control mechanisms are added to prevent damage, then reliability is improved, but device complexity increases
Solution Approach 1:
The system divides the stretching operation into multiple operation sections (first, second, third operation sections) with different threshold values. This segmentation allows the control mechanism to respond differently to various levels of strain, simplifying the control logic by handling each section independently rather than requiring complex continuous control
Solution Approach 2:
The system uses characteristic values from strain sensors that change with stretching degree. By monitoring changes in these electrical parameters (such as resistance or capacitance changes in the strain sensor), the system can detect operation sections and trigger control actions without complex mechanical sensors or control mechanisms
3Measurement precision
If multiple operation sections with threshold values are implemented, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The stress-strain profile and threshold values for different operation sections are predetermined and stored in the system before operation. This preliminary setup allows the system to quickly compare real-time strain measurements against pre-defined thresholds, achieving precise measurement without requiring complex real-time calculations or dynamic threshold adjustments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively prevents damage by controlling the display panel's operations based on detected strain, ensuring safe deformation and extending the lifespan of the apparatus.
Implementation Method 1
a strain sensor, a signal detector configured to detect a first characteristic value, and to generate stretch-sensing data, the first characteristic value corresponding to a degree of stretching of the strain sensor
Data Source
AI summary
Provided is a display apparatus including a display panel including pixels and a strain sensor, a signal detector configured to detect a first characteristic value, and to generate stretch-sensing data, the first characteristic value corresponding to a degree of stretching of the strain sensor, a memory configured to store a stress-strain profile divided into operation sections, and a signal processor configured to compare a rate of change of the first characteristic value with a threshold value of a current operation section by using the stretch-sensing data and the stress-strain profile, to determine a corresponding operation section among the operation sections, and to generate a control signal according to the corresponding operation section.